Kevin - I've gone from Dureme 50s to Jack Brown 33s to Clement MSO 40s. I just built a wheel set with tubeless Thunder Burt 54s for a long gravel ride. My favorites have been the Clements (so far - no time on the Burts yet). They are light, nice on road, and have done very well on dry single track. No flats, either, but that must be attributed mostly to luck.
I went with wider tires for the upcoming ride mainly for better comfort. The Burts are a similar weight, as well, so just bonus float. I also have several other "faster" bikes if I need to feel lighter.
Thoughts on lighter Hunqapillar build found here:
http://stonehog.com/2013/01/27/lighten-it-up/
Pics of Clements:
http://stonehog.com/2013/10/16/hunqlightfilmtest/
Some may say I've gone full circle if the Burts stay on for the long term.
Brian Hanson
Seattle, WA